MS Windows can be secured in similar ways to Linux. I used both types of OS and I used to be a system administrator. Windows is no less secured if configuration is done right.
You can remove the local wallet file once you are satisfied that your account has been successfully recovered. This will enhance security further. But do remember to save your new Owner public and private keys some where secured. And change your posting key before login to Steemit.com
RE: Recovering your hacked account with a local MS Windows Steem Wallet